STATE OF THE ART
Posted JUN 21 2015 by EMERSON.
Knowing that the transmission in alternating current is hegemonic across the globe since the beginning of work with electricity, research on the use of direct current power transmission have been shown most recently, which gives the chance that more people can organize and present in a single document, such as this one, the findings of previous work in this area of research.
There were many articles and research on power transmission area who helped in the development of this study, with definitions of what and how the conventional transmission types. “High voltage DC (HVDC) Transmission system consists of three basic parts: 1) converter station to convert AC to DC 2) transmission line 3) second converter station to convert back to AC.”( Meah; Ula, 2007, p.1). The research also relied on unconventional ways of transmission in the AC and DC field.
Still remains today a technological challenge in Brazil the application of direct current links of power transmission over long distances especially in terms of applications of inverters controlled tension. It has been in Brazil very well studied and applied the conventional HVDC system, but has not yet become large-scale applications of VSC HVDC, or transmission in high voltage direct current using the voltage source converter. (ALMEIDA, 2011, p.1)
It is important to mention the transmission based on unconventional lines on half-wavelength and the transmission in targeted AC, their transmission which are also subjects of study now, but this one focuses on the transmissions in conventional AC and DC. In the comparison of the two types of transmission, this study uses the work of Ula and Meah (2007, p.1), that says:
“Alternating current (AC) became very familiar for the industrial and domestic uses, but still for the long transmission lines, AC has some limitations which has led to the use of DC transmission in some projects. The technical detail of HVDC transmission compare to high voltage AC (HVAC) transmission is discussed to verify HVDC transmission for long distances.”
Using the idea of search, organize and simulate, this study was structured on various literature sources, some mentioned above and others that will be presented directly or indirectly throughout the work.